<template>
  <div class="row" :style="rowStyle" :class="rowClass">
    <slot></slot>
  </div>
</template>
<script>
export default {
  name: "GuluRow",
  props: {
    gutter: {
      type: [Number, String]
    },
    align: {
      type: String,
      validator(value) {
        return ["left", "right", "center"].includes(value)
      }
    }
  },
  computed: {
    rowStyle() {
      let {gutter} = this
      return {marginLeft: -gutter / 2 + "px", marginRight: -gutter / 2 + "px"}
    },
    rowClass() {
      let {align} = this
      return [align && `align-${align}`]
    }
  },
  mounted() {
    this.$children.forEach((vm) => {
      vm.gutter = this.gutter
    })
  }
}
</script>
<style scoped lang="scss">
.row {
  display: flex;
  flex-wrap: wrap;
  &.align-left {
    justify-content: flex-start;
  }
  &.align-right {
    justify-content: flex-end;
  }
  &.align-center {
    justify-content: center;
  }
}
</style>
